1RDF::Trine(3)         User Contributed Perl Documentation        RDF::Trine(3)
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NAME

6       RDF::Trine - An RDF Framework for Perl
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VERSION

9       This document describes RDF::Trine version 1.019
10

SYNOPSIS

12         use RDF::Trine;
13
14         my $store = RDF::Trine::Store::Memory->new();
15         my $model = RDF::Trine::Model->new($store);
16
17         # parse some web data into the model, and print the count of resulting RDF statements
18         RDF::Trine::Parser->parse_url_into_model( 'http://kasei.us/about/foaf.xrdf', $model );
19         print $model->size . " RDF statements parsed\n";
20
21         # Create a namespace object for the foaf vocabulary
22         my $foaf = RDF::Trine::Namespace->new( 'http://xmlns.com/foaf/0.1/' );
23
24         # Create a node object for the FOAF name property
25         my $pred = $foaf->name;
26         # alternatively:
27         # my $pred = RDF::Trine::Node::Resource->new('http://xmlns.com/foaf/0.1/name');
28
29         # Create an iterator for all the statements in the model with foaf:name as the predicate
30         my $iter = $model->get_statements(undef, $pred, undef);
31
32         # Now print the results
33         print "Names of things:\n";
34         while (my $st = $iter->next) {
35           my $s = $st->subject;
36           my $name = $st->object;
37
38           # $s and $name have string overloading, so will print correctly
39           print "The name of $s is $name\n";
40         }
41

DESCRIPTION

43       RDF::Trine provides an Resource Descriptive Framework (RDF) with an
44       emphasis on extensibility, API stability, and the presence of a test
45       suite. The package consists of several components:
46
47       •   RDF::Trine::Model - RDF model providing access to a triple store.
48           This module would typically be used to access an existing store by
49           a developer looking to "Just get stuff done."
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51       •   RDF::Trine::Parser - RDF parsers for various serialization formats
52           including RDF/XML, Turtle, RDFa, and RDF/JSON.
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54       •   RDF::Trine::Store::Memory - An in-memory, non-persistant triple
55           store. Typically used for temporary data.
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57       •   RDF::Trine::Store::DBI - A triple store for MySQL, PostgreSQL, and
58           SQLite, based on the relational schema used by Redland. Typically
59           used to for large, persistent data.
60
61       •   RDF::Trine::Iterator - Iterator classes for variable bindings and
62           RDF statements, used by RDF::Trine::Store, RDF::Trine::Model, and
63           RDF::Query.
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65       •   RDF::Trine::Namespace - A convenience class for easily constructing
66           RDF::Trine::Node::Resource objects from URI namespaces.
67

FUNCTIONS

69       "iri ( $iri )"
70           Returns a RDF::Trine::Node::Resource object with the given IRI
71           value.
72
73       "blank ( $id )"
74           Returns a RDF::Trine::Node::Blank object with the given identifier.
75
76       "literal ( $value, $lang, $dt )"
77           Returns a RDF::Trine::Node::Literal object with the given value and
78           optional language/datatype.
79
80       "variable ( $name )"
81           Returns a RDF::Trine::Node::Variable object with the given variable
82           name.
83
84       "statement ( @nodes )"
85           Returns a RDF::Trine::Statement object with the supplied node
86           objects.
87
88       "store ( $config )"
89           Returns a RDF::Trine::Store object based on the supplied
90           configuration string.
91
92       "default_useragent ( [ $ua ] )"
93           Returns the LWP::UserAgent object used by default for any operation
94           requiring network requests. Ordinarily, the calling code will
95           obtain the default user agent, and clone it before further
96           configuring it for a specific request, thus leaving the default
97           object untouched.
98
99           If $ua is passed as an argument, sets the global default user agent
100           to this object.
101

BUGS

103       Please report any bugs or feature requests to through the GitHub web
104       interface at <https://github.com/kasei/perlrdf/issues>.
105

SEE ALSO

107       <http://www.perlrdf.org/>
108

AUTHOR

110       Gregory Todd Williams  "<gwilliams@cpan.org>"
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113       Copyright (c) 2006-2012 Gregory Todd Williams. This program is free
114       software; you can redistribute it and/or modify it under the same terms
115       as Perl itself.
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119perl v5.38.0                      2023-07-21                     RDF::Trine(3)
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